James p



JAMES P. GAGE, OF NEW YORK, N. Y.

MILL FOR CRUSHING AND PULV ERIZING QUARTZ, &c.

Specification of Letters Patent No. 25,964, dated November 1, 1859.

To all whom "it may concern:

Be it known that I, JAMES P. GAGE, of the city of New York and State of New York, have invented new and useful Improvements in Machinery for Crushing, Pulverizing, or Granulating Quartz, Clays, and other Similar Substances; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings and letters of reference thereon.

In the accompanying drawings Figure I, represents a vertical cross section through the middle of the mill from front to back. Fig. II, represents a front elevation of the mill. Fig. III, represents an end or side elevation. Fig. IV, represents a top view. Fig. V, represents a horizontal section through the center of the crushing rolls and of the parts of the mill through which such horizontal section extended will pass.

In all the figures like letters represent like parts.

The nature of my invention consists mainly, in the construction and arrangement of the rolls, their axles, journals and journal boxes, and of the hopper feed box, and of guard and distributing or guide plates within the feed box, or chamber and in combining and arranging these parts together so that the feed or supply to the rolls is distributed over the whole width of the rolls as nearly in an equable amount as can be obtained, and the material acted upon by the rolls is kept over the line of contiguity of the rolls and not permitted to fly or scatter so as to obstruct or injure the journals and other parts of the mill and so as to maintain the work or strain upon the rolls equable and steady across their faces.

In the construction of crushing mills with rolls, for the purposes above named, it has been usual to feed the rolls in such a manner that the material acted upon falls upon the rolls at the middle, and the effect of this is very soon to wear the rolls at this point, and when the wear begins, it very rapidly destroys the rolls, or requires them to be turned down to make their surfaces even; and in addition to this, an uneven and irregular strain upon the rolls is constantly produced, which racks the frame and soon destroys its regular and useful action. In the mill as constructed by me these evils are avoided, and the amount of power required to drive the mill is less and better economized than in any other mill heretofore used for similar purposes.

My mill is constructed with a frame of four upright timbers arranged as shown in Fig. V, at A, A, A, A, the two front timbers being a little wider apart than the two back timbers, the connecting cross timbers being strongly bolted to the inner sides of the front timbers, and mortised into the back timbers. This frame can readily be constructed between the floor and upper sleepers of the room or building in which the mill is to be placed.

The width between the timbers from side to side should be a little greater than the width of the operating surface of the rolls, which may vary; but I recommend twenty inches as about a fair width of surface of the rolls for most purposes to which mills of this character can be usefully applied: the diameter 12 inches.

The two crushing rolls B, B, are supported upon the two strong horizontal and parallel side timbers C, C. They are to be of cast iron (I prefer not chilled), and cast upon the shafts or axles which should be of best wrought iron, and of suflicient size for strength, and steadiness. The gudgeons of the shafts of the rolls turn in journal boxes of cast iron, placed in a strong wrought iron frame or case D, D, Fig. III, firmly bolted to the upper surface of timbers C, C. The top of the frames D, D, is made separate from the other parts, and has a lip or flange (Z, (Z, at the twoends, fitting into corresponding receivers in the frames as seen at cl, cl, Fig. III, and is bolted down to the other part of the frame by screw bolts. The j ournal box of driving roller B, although movable is usually stationary against the end of the case; while the journal box of the other roller B, slides and is adjustable by the horizontal adjusting screws 6, 6, Figs. III and V, to any required degree of proximity or distance from roller B. The inner and outer sides of the journal boxes are wider than the opening in the case in which they slide as seen at f, f, (Fig. III,) so as to form lips or projections to hold and guide them along the case as required. The topplate is bored for oiling-holes, but not directly over the center of the journalsand the upper surface of the journal boxes is saucered to catch and hold the oil. The

axle of the driving roller B is prolonged at each end so as to receive at one end the driv- 

